[Bugfix] Mamba cache Cuda Graph padding #6214
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…ape and not by number of sequences. This is so we pad the mamba cache to the captured CG batch sizes
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The current Jamba implementation doesn't allow use of Cuda Graph with batch sizes that weren't captured. When trying to do that, a RuntimeError is raised with incompatible tensor shapes. This happens because the mamba cache wasn't padded to the Cuda Graph batch size.
This PR fixes this issue, and adds a test to assert it.